Dukat koronny - Jan II Kazimierz Waza Kraków mint

These ducats were struck at the precise moment the Polish-Lithuanian Commonwealth was collapsing under simultaneous invasion — Swedish forces occupied Warsaw and Kraków in 1655, the Prussian Hohenzollerns repudiated their vassal obligations, and Cossack and Muscovite pressure continued in the east. The period is remembered in Polish historiography as the Potop, the Deluge. Jan II Kazimierz fled to Silesia in November 1655, yet the Kraków mint continued intermittent production, which explains the documented die proliferation across the Kopicki references for this four-year span.

The five Kopicki varieties reflect meaningful differences in die engraving rather than simple collector splitting — a consequence of disrupted mint staffing during occupation and resumption.